scholarly journals Solid-State Phase Transformation and Self-Assembly of Amorphous Nanoparticles into Higher-Order Mineral Structures

2020 ◽  
Vol 142 (29) ◽  
pp. 12811-12825 ◽  
Author(s):  
Stanislas Von Euw ◽  
Thierry Azaïs ◽  
Viacheslav Manichev ◽  
Guillaume Laurent ◽  
Gérard Pehau-Arnaudet ◽  
...  
Keyword(s):  
Phase Transformation ◽  
Solid State ◽  
Self Assembly ◽  
Higher Order ◽  
Solid State Phase Transformation ◽  
Amorphous Nanoparticles

scholarly journals Solid-State Phase Transformation and Self-Assembly of Amorphous Nanoparticles into Higher-Order Mineral Structures

2019 ◽  
Author(s):  
Stanislas Von Euw ◽  
Viacheslav Manichev ◽  
Margarita Rivers ◽  
Nagarajan Murali ◽  
Daniel J. Kelly ◽  
...  
Keyword(s):  
Phase Transformation ◽  
Solid State ◽  
Free Water ◽  
Higher Order ◽  
Similar Process ◽  
Water Molecules ◽  
Classical Pathway ◽  
Amorphous Calcium Carbonate ◽  
Solid State Phase Transformation ◽  
Amorphous Nanoparticles

Digging into nonclassical pathways to crystallization to unearth design principles for fabricating advanced functionalized materials shapes the future of materials science. Nature has long since been exploiting such nonclassical pathways to crystallization to build inorganic-organic hybrid materials that fulfill support, mastication, defense, attack, or optical functions. Especially, various biomineralizing taxa such as stony corals deposit metastable, magnesium-rich, amorphous calcium carbonate nanoparticles that further transform into higher-order mineral structures. Here we examine whether a similar process can be duplicate in abiogenic conditions using synthetic, amorphous calcium magnesium carbonate nanoparticles. Applying a combination of ultrahigh-resolution imaging, and, in situ, solidstate nuclear magnetic resonance (NMR) spectroscopy, we reveal the underlying mechanism of the phase transformation of these synthetic amorphous nanoparticles into crystals. When soaked in water, these synthetic amorphous nanoparticles are coated by a rigid hydration layer of bound water molecules. In addition, fast chemical exchanges occur between hydrogens from the nanoparticles and those from the free water molecules of the surrounding aqueous medium. At some stage, crystallization spontaneously occurs, and we provide spectroscopic evidence for a solid-state phase transformation of the starting amorphous nanoparticles into crystals. Depending on their initial chemical composition, and especially on the amount of magnesium, the starting amorphous nanoparticles can aggregate and form ordered mineral structures through crystal growth by particle attachment, or rather dissolve and reprecipitate into another crystalline phase. The former scenario offers promising prospects for exerting some control over such non-classical pathway to crystallization to design mineral structures that could not be achieved through a classical layer-by-layer growth.<br>

scholarly journals Solid-State Phase Transformation and Self-Assembly of Amorphous Nanoparticles into Higher-Order Mineral Structures

2019 ◽  
Author(s):  
Stanislas Von Euw ◽  
Viacheslav Manichev ◽  
Margarita Rivers ◽  
Nagarajan Murali ◽  
Daniel J. Kelly ◽  
...  
Keyword(s):  
Phase Transformation ◽  
Solid State ◽  
Free Water ◽  
Higher Order ◽  
Similar Process ◽  
Water Molecules ◽  
Classical Pathway ◽  
Amorphous Calcium Carbonate ◽  
Solid State Phase Transformation ◽  
Amorphous Nanoparticles

Digging into nonclassical pathways to crystallization to unearth design principles for fabricating advanced functionalized materials shapes the future of materials science. Nature has long since been exploiting such nonclassical pathways to crystallization to build inorganic-organic hybrid materials that fulfill support, mastication, defense, attack, or optical functions. Especially, various biomineralizing taxa such as stony corals deposit metastable, magnesium-rich, amorphous calcium carbonate nanoparticles that further transform into higher-order mineral structures. Here we examine whether a similar process can be duplicate in abiogenic conditions using synthetic, amorphous calcium magnesium carbonate nanoparticles. Applying a combination of ultrahigh-resolution imaging, and, in situ, solidstate nuclear magnetic resonance (NMR) spectroscopy, we reveal the underlying mechanism of the phase transformation of these synthetic amorphous nanoparticles into crystals. When soaked in water, these synthetic amorphous nanoparticles are coated by a rigid hydration layer of bound water molecules. In addition, fast chemical exchanges occur between hydrogens from the nanoparticles and those from the free water molecules of the surrounding aqueous medium. At some stage, crystallization spontaneously occurs, and we provide spectroscopic evidence for a solid-state phase transformation of the starting amorphous nanoparticles into crystals. Depending on their initial chemical composition, and especially on the amount of magnesium, the starting amorphous nanoparticles can aggregate and form ordered mineral structures through crystal growth by particle attachment, or rather dissolve and reprecipitate into another crystalline phase. The former scenario offers promising prospects for exerting some control over such non-classical pathway to crystallization to design mineral structures that could not be achieved through a classical layer-by-layer growth.<br>

scholarly journals Solid state phase transformation kinetics in Zr-base alloys

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
A. R. Massih ◽  
Lars O. Jernkvist
Keyword(s):  
Phase Transformation ◽  
Solid State ◽  
Zirconium Alloys ◽  
Excess Oxygen ◽  
Transformation Kinetics ◽  
Fuel Cladding ◽  
Reactor Accident ◽  
Phase Transformation Kinetics ◽  
Solid State Phase Transformation ◽  
Water Reactors

AbstractWe present a kinetic model for solid state phase transformation ($$\alpha \rightleftharpoons \beta$$ α ⇌ β ) of common zirconium alloys used as fuel cladding material in light water reactors. The model computes the relative amounts of $$\beta$$ β or $$\alpha$$ α phase fraction as a function of time or temperature in the alloys. The model accounts for the influence of excess oxygen (due to oxidation) and hydrogen concentration (due to hydrogen pickup) on phase transformation kinetics. Two variants of the model denoted by A and B are presented. Model A is suitable for simulation of laboratory experiments in which the heating/cooling rate is constant and is prescribed. Model B is more generic. We compare the results of our model computations, for both A and B variants, with accessible experimental data reported in the literature covering heating/cooling rates of up to 100 K/s. The results of our comparison are satisfactory, especially for model A. Our model B is intended for implementation in fuel rod behavior computer programs, applicable to a reactor accident situation, in which the Zr-based fuel cladding may go through $$\alpha \rightleftharpoons \beta$$ α ⇌ β phase transformation.

Solid state phase transformation study on a series of Pu–Ga alloys containing 0.18–0.63wt.% Ga

2014 ◽  
Vol 586 ◽  
pp. 709-717 ◽  
Author(s):  
Michael Ling ◽  
Roderick F.E. Jenkins ◽  
Nigel Park
Keyword(s):  
Phase Transformation ◽  
Solid State ◽  
Solid State Phase Transformation ◽  
Transformation Study

Analysis of elastic–plastic accommodation due to volume misfit upon solid-state phase transformation

2014 ◽  
Vol 64 ◽  
pp. 266-281 ◽  
Author(s):  
S.J. Song ◽  
F. Liu ◽  
Z.H. Zhang
Keyword(s):  
Phase Transformation ◽  
Solid State ◽  
Elastic Plastic ◽  
Solid State Phase Transformation

Effect of Destabilizing Heat Treatment on Solid-State Phase Transformation in High-Chromium Cast Irons

2013 ◽  
Vol 44 (12) ◽  
pp. 5434-5446 ◽  
Author(s):  
Vasily Efremenko ◽  
Kazumichi Shimizu ◽  
Yuliia Chabak
Keyword(s):  
Heat Treatment ◽  
Phase Transformation ◽  
Solid State ◽  
Cast Irons ◽  
High Chromium ◽  
Solid State Phase Transformation
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